Peter Murray with Talon Helicopters says, pilots are not permitted to fly in dense fog as they operate under visual flight rules.

As a result, they're forced to manually move their helicopters above the dense fog to enable assistance with the North Shore Rescue.

"Some years this persists for many, many days, so we’ll actually take the main rotor blades off the helicopter, lift it onto a truck with a crane, and drive the aircraft up into the mountains," Murray explains. "Then we put the blades back on and fly it off the trailer so it’s ready to go at a moment’s notice for the search and rescue teams."

While the recent fog has made road and air travel tricky, it's also inspired some spectacular photos. Take a look: